scholarly journals Verification of Polyhedral DEM with Laboratory Grinding Mill Experiments

2022 ◽  
Author(s):  
Alberto M. Puga ◽  
Nicolin Govender ◽  
Raj K. Rajamani
Keyword(s):  
Grinding Mill

Harrison's Grinding Mill

1854 ◽  
Vol 9 (44) ◽  
pp. 345-345
Keyword(s):  
Grinding Mill

Low Frequency Noise from a Big Building Due to Oscillatory Forces of a Machine

1982 ◽  
Vol 1 (1) ◽  
pp. 22-27 ◽  
Author(s):  
Niichi Nishiwaki ◽  
Noboru Fujio ◽  
Takuji Mori
Keyword(s):  
Low Frequency ◽  
Ground Vibration ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Ground Acceleration ◽  
Building Frames ◽  
Acceleration Level ◽  
Residential District ◽  
Factory Building ◽  
Grinding Mill

People living in houses near a big factory complained about chattering of glass windows. At one of these houses, the SPL of low frequency noise was about 66 dB at 5.5 Hz and ground acceleration level was about 40 dB at 9 Hz in the horizontal direction. (0 dB acceleration = 10−5 m/s2). We found that the noise and ground vibration were caused by a big grinding mill in the factory, because both SPL and acceleration level at the residential district were considerably decreased when the mill was not in operation. We also confirmed that low frequency noise was not transmitted from the grinding mill directly, but was due to the resonant vibration of walls of the factory building. Two ideas are studied here to suppress the noise, one of which is to isolate the vibration of the grinding mill at its foundation, and the other is to improve the stiffness of the building frames to stop the wall vibration. As a result of the study, the latter method to increase the stiffness of the building was adopted. The SPL of low frequency noise near the wall was decreased.

Mathematical model of an air-swept centrifugal grit grinding mill

1992 ◽  
Vol 28 (1) ◽  
pp. 28-31
Author(s):  
A. I. Zaitsev ◽  
D. O. Bytev
Keyword(s):  
Mathematical Model ◽  
Grinding Mill

scholarly journals Plant-wide control of grinding mill circuits: Top-down analysis

2016 ◽  
Vol 49 (20) ◽  
pp. 72-77 ◽  
Author(s):  
J.D. le Roux ◽  
S. Skogestad ◽  
I.K. Craig
Keyword(s):  
Top Down ◽  
Grinding Mill

Grinding mill circuits — A survey of control and economic concerns

2009 ◽  
Vol 90 (1-4) ◽  
pp. 56-66 ◽  
Author(s):  
Donghui Wei ◽  
Ian K. Craig
Keyword(s):  
Grinding Mill

scholarly journals Requirements for estimating the volume of rocks and balls in a grinding mill

2017 ◽  
Vol 50 (1) ◽  
pp. 1169-1174 ◽  
Author(s):  
J.D. le Roux ◽  
I.K. Craig
Keyword(s):  
Grinding Mill

On the problem of control over the primary grinding mill ball charging

2021 ◽  
pp. 17-22
Author(s):  
I. V. Sokolov ◽  
A. V. Kuzyakov
Keyword(s):  
Consumption Rate ◽  
Service Providers ◽  
International Service ◽  
Analysis Techniques ◽  
Operational Costs ◽  
Charge Spectrum ◽  
Approval Procedure ◽  
Charge Analysis ◽  
Mill Process ◽  
Grinding Mill

Considering the fact that the costs related to grinding balls and electric power account for a significant share of operational costs incurred by concentrator plants, this paper highlights the relevance of using an optimized ball charge. The paper considers a conventional approach to ball charging, which involves doing calculations on the basis of a given throughput. The latter serves as a parameter for the specific ball consumption rate approval procedure. At the same time, no consideration is given for the ball wear rate as a parameter defining the grinding performance. It is noted that the ball charge dynamics can be analyzed based on the noise produced by the mill, or the vibroacoustic parameters of the mill. The paper examines some vibro-acoustic ball charge analysis techniques utilized by both domestic and international service providers. It is noted that in all these cases the technique uses just one physical parameter, which is not enough to monitor the total mill load. The VAZM-1M analyzer developed by Soyuztsvetmetavtomatika JSC analyzes and calculates an integral amplitude of the mill vibro-acoustic field. This ensures that all components of the grinding process are taken into account. The paper takes a detailed view of the findings obtained upon analysis of the primary grinding mill ball charge. The work was carried out at the Erdenet concentrator plant as part of contractual scope. A number of different ball charge options was considered, and is it noted that none of the options can resolve this problem completely. The authors describe a possibility to monitor the mill process load with the help of the VAZM-1M analyzer. The authors also analyzed the experiments that aimed at identifying the grinding parameters governed by the mill ball charge. It is shown that the VAZM-1M analyzer gives adequate readings of any ball charge deviations. The mill spectrum registered by the VAZM-1M analyzer contains a resonance peak, which is believed to correlate as a small mill ball charge spectrum. In this regard, a plan of further research was drafted that relies on the use of the VAZM-1M analyzer. The aim is to identify an exact frequency band that would adequately correlate with the mill ball charge.

scholarly journals Brush-Holder Integrated Load Sensor Prototype for SAG Grinding Mill Motor

Electronics ◽  
2019 ◽  
Vol 8 (11) ◽  
pp. 1227 ◽  
Author(s):  
Carrasco ◽  
Álvarez ◽  
Velázquez ◽  
Concha ◽  
Pérez-Cotapos
Keyword(s):  
Measurement Errors ◽  
Large Scale ◽  
Mining Industry ◽  
Data Entry ◽  
Inspection Time ◽  
Inspection System ◽  
Design Development ◽  
Internal Parameters ◽  
Inspection Tasks ◽  
Grinding Mill

One of the most widely used electro-mechanical systems in large-scale mining is the electric motor. This device is employed in practically every phase of production. For this reason, it needs to be inspected regularly to maintain maximum operability, thus avoiding unplanned stoppages. In order to identify potential faults, regular check-ups are performed to measure the internal parameters of the components, especially the brushes and brush-holders. Both components must be properly aligned and calibrated to avoid electric arcs to the internal insulation of the motor. Although there is an increasing effort to improve inspection tasks, most inspection procedures are manual, leading to unnecessary costs in inspection time, errors in data entry, and, in extreme cases, measurement errors. This research presents the design, development, and assessment of an integrated measurement prototype for measuring spring tension and other key parameters in brush-holders used in electric motors. It aims to provide the mining industry with a new, fully automatic inspection system that will facilitate maintenance and checking. Our development research was carried out specifically on the brush system of a SAG grinding mill motor. These machines commonly use SIEMENS motors; however, the instrument can be easily adapted to any motor by simply changing the physical dimensions of the prototype.

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